President Obama’s visit to Southeast Asia this week will take him to Cambodia, Burma, and Thailand. The Association of Southeast Asian Nations (ASEAN) leaders’ meetings in Phnom Penh is the occasion for the transpacific flight, and Burma will generate the most news. It is Thailand, however, that is the most strategically important part of the trip. The political establishment in Washington, over many years and on a bipartisan basis, has not given Thailand the sort of sustained attention it deserves as a treaty ally. President Obama’s visit to Bangkok is an opportunity to right the alliance ship and chart a clear course for the future.